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Sökning: WFRF:(S Blaabjerg)

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  • AT, Andersen, et al. (författare)
  • A partially-blocking queueing system with CBR/VBR and ABR/UBR arrival streams
  • 2002
  • Ingår i: Telecommunications Systems. - : Baltzer Academic Publisher. - 1018-4864 .- 1572-9451. ; 19:1, s. 75-99
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper we consider an ATM transmission link., to which CBR or VBR and ABR or UBR calls arrive according to independent Poisson processes. CBR/VBR calls (characterized by their equivalent bandwidth) are blocked and leave the system if the available link capacity is less than required at the time of arrival. ABR/UBR calls, however, accept partial blocking, meaning that they may enter service even if the available capacity is less than the specified required peak bandwidth, but greater than the so called minimal accepted bandwidth. Partially blocked ABR/UBR calls instead experience longer service time, since smaller given bandwidth entails proportionally longer time spent in the system, as first suggested in [3] and analyzed in details herein. Throughout the life time of an ABR/UBR connection, its bandwidth consumption fluctuates in accordance with the current load on the link but always at the highest possible value up to their peak bandwidth (greedy sources). Additionally, if this minimal accepted bandwidth is unavailable at the time of arrival, ABR/UBR calls are allowed to wait in a finite queue. This system is modeled by a Continuous Time Markov Chain (CTMC) and the CBR/VBR and ABR/UBR blocking probabilities and the mean ABR/UBR waiting- and service times are derived.
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  • G, Fodor, et al. (författare)
  • Revenue optimization and fairness control of priced guaranteed and best effort services on an ATM transmission link
  • 1998
  • Ingår i: ICC 98 - 1998 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS VOLS 1-3. - New York : IEEE. ; , s. 1696-1705
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
    • This paper is the sequel of two previous papers describing and analyzing partially blocking-queueing systems. In [1, 2] we proposed the extension of the classical multirate circuit switched loss model [11] in order to model and analyze on the call level ATM systems supporting best effort type service classes, such as the ABR or UBR service classes. After a brief review of the basic modelling concepts, in this paper we are concerned with optimal Call Admission Control, (CAC) of CBR/VBR and ABR/UBR calls in the sense that we want to maximize the revenue on a single ATM link when both QoS guaranteed and best effort service classes are present. We formulate the problem as a Markov Decision Problem [3, 4, 5, 11, 13, 15, 16] and find that the concept of intelligent blocking is useful in this context. We solve this optimization task by policy iteration to find the blocking states of the link. This modelling framework (in its present form and by extensions) allows to study the impact of pricing policies on CAC and fairness.
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